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Zhang X.,Hubei Automotive Industries Institute | Lu J.,Harbin Institute of Technology
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2013

Laser sustained plasma (LSP) propulsion mechanism is the key to laser propulsion technology. On the basis of the average atom (ion) model (AAM) and the collision radiation model (CRM), the interactive process between laser and plasma is simulated by coupling method to obtain some characteristic parameters. The experimental results of laser shooting carbon target prove the exactness of simulated results, and show that laser dipulse shooting carbon target can produce more impulse coupling coefficients by 50% at maximum than that by single pulse, which is favored to laser propulsion. This meaningful work will provide reference for further investigation on laser sustained plasma propulsion. Source


Bao W.,Hubei Automotive Industries Institute
Applied Mechanics and Materials | Year: 2014

The torsion fatigue life test which aimed at the automotive steering shaft designs the test bed of micro-controller based on PIC16F877 and makes the accurate test methods possible. The installation of a torque sensor in series with the magnetic particle brake can detect feedback on the test load. A serial port communication between micro-controller and programmable power supply can automatically adjust the output of current size of programmable power supply, and make torsional load output by the magnetic particle brake constant. The system is not only accurate in statistics testing and capable of memorizing the number of tests but also low cost and of practical value. © (2014) Trans Tech Publications, Switzerland. Source


Zhao G.H.,Hubei Automotive Industries Institute
Applied Mechanics and Materials | Year: 2014

In large continuous rolling process, that the roller can be accurately control have an important impact on production. In allusion to the characteristics of variable and nonlinear of hydraulic servo system parameters for controlling roller position, fuzzy PI control and adjusting the parameters in on-line are used, in order to realize the three cylinder synchronous control. The research results indicate: for system with external force disturbance, the fuzzy adaptive control has a strong anti-interference ability, and improve the robustness of the control system of multi-cylinder synchronization, as a result, to obtain the satisfactory control effect. To be carried out simulation with Matlab, the results show that the fuzzy PI control scheme is a high precision, efficient and feasible method, and can obtain the satisfactory results. © (2014) Trans Tech Publications, Switzerland. Source


Zhao G.H.,Hubei Automotive Industries Institute
Applied Mechanics and Materials | Year: 2014

In allusion to the system that there is but only severe time-varying and non-flexible coupling between the two hydraulic channels, the daul-cylinder hydraulic synchronous movement servo control system is designed for large die casting equipment, and its control model is establish. By guiding thought of self learning control strategy, two levels of speed control scheme is adopted in the hydraulic system, namely the level adjustment and secondary servo compensation adjustment. On the basis, adaptive learning control scheme is established. Thus, its control strategy algorithm of incremental form is presented. Finally, through MATLAB(R2010a), the simulation analysis has been carried on to the system, the emulational results show that the control scheme can make the system to achieve excellent performances of synchronous movement. © (2014) Trans Tech Publications, Switzerland. Source


Zhao G.H.,Hubei Automotive Industries Institute
Advanced Materials Research | Year: 2014

To the pusher and variable load synchronous motion of hydraulic dual-cylinder system, the "Bang-Bang" control mechanism and the non-continuous control technology are adopted. The hydraulic system that used the ordinary realizes a synchronization error less than two percent. The stability and reliability of the system are improved and the cost of the system is reduced. Especially in the pusher and other industrial areas, the hydraulic system is more suitable for engineering application. By the ability of computers' "software servo control", the output of the application system can meet the performance standard and make complex mechanical control. it proves that a non-continuous control method is an effective way to carry out the digital control. © (2014) Trans Tech Publications, Switzerland. Source

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